It's sad but true. There isn't much majesty, subtlety or class anymore. Flirting is not a fine art as much as it is a clumsy brute force attack on the other persons senses. Make some sly remarks, try to reel them in slowly and they don't even notice what you're doing and get bored. You pretty much have to whip it out and say "How bout it?" before woman in the 18 to 24 year old range understand what you're doing and what's going on. It doesn't help that in Australian culture getting absolutely shit-faced is just 'gentle social lubricant' and what everyone in this age range does all the time.
If you plan a project, work for weeks or months at slowly getting to know a girl, and integrate yourself in her life, by the time you get to the point of a relationship chances are she well have had sex with 3 other guys and decided one of them would be better to date in the time you spent laying the groundwork.

Perhaps girls who are up around 25-30 have more style and class, and dating might actually require more finesse rather than heavy handed, ham fisted tactics. I don't know, I've been off the market since I was 24.